In this paper, we apply Eqs. (REF ) and () directly to the published experimental data [1]} to estimate the change in the ratio when switching the \(x\) -axis between \(c\)  and \(N_{\mathrm {ch}}\) . We then investigate the origin of this change using a multiphase transport (AMPT) model [2]}. A previous study [3]} explains how \(p(N_{\mathrm {ch}})\)  is influenced by each of the four WS parameters (\(R_0\) , \(a_0\) , \(\beta _2\) , and \(\beta _3\) ). The values of these parameters for the isobaric nuclei are taken from Ref. [3]} and listed in Table REF . Each scenario of the AMPT study
has a relation between \(c\)  and \(N_{\mathrm {ch}}\) , similar to the real data in Fig. REF . These relations in turn can be used as input for Eqs. (REF ) and () to estimate the impact of each parameter on \(\Delta R_{\mathcal {O}}\) , when switching between the centrality dependence and the \(N_{\mathrm {ch}}\)  dependence.
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